滑轮：力学上的一种装置，在边缘装有活动绳索、弦、缆、链条或带子的轮。
Pulley: in mechanics, a wheel that carries a flexible rope, cord, cable, chain, or Belt on its rim.
曲柄链条动滑轮式长冲程抽油机是一种新型抽油机。
The crank-chain driving and long stroke pumping unit described in this papes is a new type of pumping unit.
曲柄链条动滑轮式长冲程抽油机是一种新型抽油机。
The crank-chain driving and long stroke pumping unit described in this papes is a new type of pumping unit.
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